Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
regulation 11.3.4 » regulation 1.3.3, regulation 11.2.3, regulation 11.4
el communication » cell communication, real communication, 3 communication
technology de » technology does, technology dlt, technology 1
de regulation » trade regulation, use regulations, data regulation
11.3.4 crisis » 11.3.4 risk, 13.2 crisis, 13.2.2 crisis
crisis el » crisis _, crisis a, crisis 1
cost data » test data

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: technology de regulation 11.3.4 crisis el communication cost data envelopment _ aortic.*.